The British royal family arrived at Buckingham Palace on March 5 for a very special celebration in honor of Prince Charles. It's been 50 years since the prince's investiture, when he formally became the Prince of Wales, and he was surrounded by his closest relatives at a special morning reception that marked the important anniversary. Queen Elizabeth, Princess Anne, and Camilla, Duchess of Cornwall, were all in attendance, but for many royal fans, the big reason to get excited was the chance to see Prince William, Kate Middleton, Prince Harry, and Meghan Markle, aka the royal "Fab Four," back together.